“We’re aware of reports that access to Signal has been blocked in some countries,” Signal says. If you are affected by the blocks, the company recommends turning on its censorship circumvention feature. (NetBlocks reports that this feature lets Signal “remain usable” in Russia.)
Yep. Though not sure about Russia but I know China can and does block the majority of usual Tor access methods including the obfuscating pluggable transports like obfs4/snowflake/etc.